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Telecommunication system comprising a central ip router composed of a satellite and of a ground router

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Telecommunication system comprising a central ip router composed of a satellite and of a ground router


The subject of the invention is a satellite comprising at least one central router, a source terminal and a destination terminal. The source terminal comprises means for transmitting, via the central router, IP packets fragmented into at least one level-2 fragment to the destination terminal to which a destination IP address is allocated. The said central router is composed of a satellite and of a ground router. The satellite comprises means for implementing a switching of the IP packets without reassembling the level-2 fragments sent by the source terminal to the destination terminal, the said fragments comprising a reference to the Destination IP address used as basis for the switching. The ground router comprises means for determining IP routing parameters, the said parameters being transmitted by the ground router to the satellite so as to configure the way in which the switching is carried out by the said satellite.
Related Terms: Ip Address Router Communication System Telecommunication Telecommunication System

Inventors: Fabrice HOBAYA, Cédric BAUDOIN, Emmanuel CHAPUT, Patrick GELARD
USPTO Applicaton #: #20130003651 - Class: 370316 (USPTO) - 01/03/13 - Class 370 
Multiplex Communications > Communication Over Free Space >Repeater >Airborne Or Space Satellite Repeater

Inventors:

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The Patent Description & Claims data below is from USPTO Patent Application 20130003651, Telecommunication system comprising a central ip router composed of a satellite and of a ground router.

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CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to foreign French patent application No. FR 11 02034, filed on Jun. 30, 2011, the disclosure of which is incorporated by reference in its entirety.

FIELD OF THE INVENTION

The invention relates to a telecommunication system comprising a central IP router composed of a satellite playing the role of IP switch and of a ground router making it possible to carry out the other routing functions. It applies notably to the fields of satellite communications.

BACKGROUND OF THE INVENTION

There exist today satellite telecommunication systems composed of one or more satellites comprising an onboard IP router and allowing terminals to communicate with one another without passing through a terrestrial relay.

In this description, a terminal denotes any item of equipment comprising means for receiving and sending data originating from another item of equipment via one or more satellites belonging to the system. Thus a terminal may be a server, a laptop computer, an aircraft or any type of item of equipment meeting this definition.

An onboard IP router carried by a satellite makes it possible to obtain flexibility in terms of IP addressing plane. Moreover, the complexity of the terminals of the system communicating with the said satellite is reduced. Furthermore, the double-voucher phenomenon is avoided for performing the IP routing since an intermediate terminal, playing the role of gateway, is not required. Moreover, the volume of routing signaling generated on the satellite segment is reduced, as is the convergence time of the routing tables for the terminals of the system.

The processing operations and computations performed by the satellite are implemented by at least one onboard processing unit customarily denoted by the acronym OBP standing for the expression “On Board Processor”. The existing systems using an onboard IP router require a level-3 OBP. In the description, levels 2 and 3 refer to the levels of the OSI reference model, the acronym standing for the expression “Open Systems Interconnection”.

An exemplary system comprising an onboard IP router carried within a satellite is the CLEO system, the acronym standing for the expression “Cisco router in Low Earth Orbit”. This experimentation system carries onboard a conventional IP router on a secondary payload of a flyby satellite. Another system denoted by the acronym IRIS standing for the expression “Internet Routing in Space Router” has thereafter been implemented, the said system making it possible to interconnect terminals via an onboard IP router within an Intelsat IS-14 geostationary satellite. This router has the same functionalities and the same capacities as a terrestrial IP router but it can be carried aboard the satellite.

A drawback of this type of system is that an IP router onboard a satellite is difficult to achieve in practice. Indeed, considerable hardware resources are required, notably in terms of memories and computation power. Now, the onboard payload carried in a satellite is limited. Consequently, the existing solutions can only support limited bitrates.

SUMMARY

OF THE INVENTION

An aim of the invention is notably to alleviate the aforementioned drawbacks.

For this purpose the subject of the invention is a telecommunication system comprising at least one central router, a source terminal and a destination terminal. The source terminal comprises means for transmitting, via the central router, IP packets fragmented into at least one level-2 fragment to the destination terminal to which a destination IP address is allocated. The said central router is composed of a satellite and of a ground router, the said satellite comprising means for implementing a switching of the IP packets without reassembling the level-2 fragments sent by the source terminal to the destination terminal. The fragments comprise a reference to the Destination IP address used as basis for the switching. The ground router comprises means for determining useful IP routing parameters for implementing the IP switching, the said parameters being transmitted by the ground router to the satellite so as to configure the way in which the switching is carried out by the said satellite.

The reference to the Destination IP address is the Destination IP address itself.

In one embodiment, the reference to the Destination IP address is a reference label.

According to one aspect of the invention, the reference label is added to the header of the level-2 fragments by the source terminal.

According to another aspect of the invention, the size of the first level-2 fragment of an IP packet after fragmentation is at least equal to the size of the level-2 header plus the size of the IP header.

The satellite records for example the association between the IP switching label and the Destination IP address with the passage of the first level-2 fragment of an IP packet.

The size of the IP switching label is for example 1 byte.

An IP switching label corresponds for example to a local variable specific to each terminal.

According to one aspect of the invention, the information items relating to the IP routing and to the IP switching are stored in the ground router in the form of tables.

The satellite can comprise a routing table for the satellite, the said table containing the destination IP address, a mask when it entails a network address, the number of the associated output port and the level-2 address of a gateway.

In one embodiment, the satellite decrements the TTL field of the IP header during the passage of the first level-2 fragment.

The DVB-S2 and DVB-RCS2 technologies may be used within the framework of the invention.

The subject of the invention is also a communication satellite comprising means for implementing a switching of IP packets without reassembling the level-2 fragments sent by a source terminal to a destination terminal, the said fragments comprising a reference to the Destination IP address used as basis for the switching.

The subject of the invention is also a ground router comprising means for determining IP packet routing parameters, the said parameters being transmitted by the ground router to the satellite carrying out the IP packet switching.



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Multiplex communications
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stats Patent Info
Application #
US 20130003651 A1
Publish Date
01/03/2013
Document #
13539397
File Date
06/30/2012
USPTO Class
370316
Other USPTO Classes
International Class
04B7/185
Drawings
3


Ip Address
Router
Communication System
Telecommunication
Telecommunication System


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